:root {
            --primary: #1890ff;
            --primary-hover: #40a9ff;
            --primary-light: #e6f7ff;
            --bg-body: #f0f2f5;
            --bg-card: #ffffff;
            --text-main: #262626;
            --text-sub: #8c8c8c;
            --border-radius: 12px;
            --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
            --transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-body);
            color: var(--text-main);
            line-height: 1.6;
        }

        /* 顶部导航 */
        .header {
            background: #fff;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            height: 64px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 20px;
            font-weight: 600;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text-sub);
            font-size: 14px;
            margin-left: 20px;
            transition: color 0.3s;
        }

        .nav-links a:hover {
            color: var(--primary);
        }

        /* 主体内容 */
        .container {
            max-width: 1200px;
            margin: 30px auto;
            padding: 0 20px;
        }

        /* 分类选择器 */
        .tabs-container {
            display: flex;
            gap: 10px;
            margin-bottom: 30px;
            overflow-x: auto;
            padding-bottom: 5px;
            scrollbar-width: none;
        }
        .tabs-container::-webkit-scrollbar { display: none; }

        .tab-item {
            padding: 8px 20px;
            background: #fff;
            border: 1px solid #d9d9d9;
            border-radius: 20px;
            cursor: pointer;
            white-space: nowrap;
            font-size: 14px;
            transition: var(--transition);
        }

        .tab-item.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 4px 10px rgba(24, 144, 255, 0.3);
        }

        /* 网站区块 */
        .category-section {
            display: none;
            animation: fadeIn 0.4s ease;
        }

        .category-section.active {
            display: block;
        }

        .section-title {
            font-size: 18px;
            margin-bottom: 20px;
            padding-left: 10px;
            border-left: 4px solid var(--primary);
            font-weight: 600;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 16px;
        }

        /* 网站卡片 */
        .card {
            background: var(--bg-card);
            border-radius: var(--border-radius);
            padding: 16px;
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
            border: 1px solid transparent;
            box-shadow: var(--shadow);
        }

        .card:hover {
            transform: translateY(-3px);
            border-color: var(--primary);
            box-shadow: 0 8px 20px rgba(0,0,0,0.08);
        }

        .card-icon {
            width: 44px;
            height: 44px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 10px;
            font-weight: bold;
            font-size: 16px;
            flex-shrink: 0;
        }

        .card-info {
            overflow: hidden;
        }

        .card-name {
            display: block;
            font-weight: 600;
            font-size: 14px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            margin-bottom: 2px;
        }

        .card-desc {
            display: block;
            font-size: 12px;
            color: var(--text-sub);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* 页脚 */
        .footer {
            text-align: center;
            padding: 40px 0;
            color: var(--text-sub);
            font-size: 13px;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* 响应式调整 */
        @media (max-width: 480px) {
            .grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
            .card {
                flex-direction: column;
                text-align: center;
                padding: 12px 8px;
            }
            .card-icon { margin-bottom: 5px; }
        }